Alc/wave.c

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 1999-2007 by authors.
   4  * This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  *  License along with this library; if not, write to the
  16  *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  *  Boston, MA  02111-1307, USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #include "config.h"
  22
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <memory.h>
  26 #include "alMain.h"
  27 #include "AL/al.h"
  28 #include "AL/alc.h"
  29
  30
  31 typedef struct {
  32     FILE *f;
  33     long DataStart;
  34
  35     ALvoid *buffer;
  36     ALuint size;
  37
  38     volatile int killNow;
  39     ALvoid *thread;
  40 } wave_data;
  41
  42
  43 static const ALCchar waveDevice[] = "Wave File Writer";
  44
  45
  46 static ALuint WaveProc(ALvoid *ptr)
  47 {
  48     ALCdevice *pDevice = (ALCdevice*)ptr;
  49     wave_data *data = (wave_data*)pDevice->ExtraData;
  50     ALuint frameSize;
  51     ALuint now, last;
  52     size_t fs;
  53     ALuint avail;
  54     union {
  55         short s;
  56         char b[sizeof(short)];
  57     } uSB;
  58
  59     uSB.s = 1;
  60     frameSize = aluBytesFromFormat(pDevice->Format) *
  61                 aluChannelsFromFormat(pDevice->Format);
  62
  63     last = timeGetTime();
  64     while(!data->killNow && pDevice->Connected)
  65     {
  66         now = timeGetTime();
  67
  68         avail = (now-last) * pDevice->Frequency / 1000;
  69         if(avail < pDevice->UpdateSize)
  70         {
  71             Sleep(1);
  72             continue;
  73         }
  74
  75         while(avail >= pDevice->UpdateSize)
  76         {
  77             aluMixData(pDevice, data->buffer, pDevice->UpdateSize);
  78
  79             if(uSB.b[0] != 1 && aluBytesFromFormat(pDevice->Format) > 1)
  80             {
  81                 ALubyte *bytes = data->buffer;
  82                 ALuint i;
  83
  84                 for(i = 0;i < data->size;i++)
  85                     fputc(bytes[i^1], data->f);
  86             }
  87             else
  88                 fs = fwrite(data->buffer, frameSize, pDevice->UpdateSize,
  89                             data->f);
  90             if(ferror(data->f))
  91             {
  92                 AL_PRINT("Error writing to file\n");
  93                 aluHandleDisconnect(pDevice);
  94                 break;
  95             }
  96
  97             avail -= pDevice->UpdateSize;
  98         }
  99         last = now;
 100     }
 101
 102     return 0;
 103 }
 104
 105 static ALCboolean wave_open_playback(ALCdevice *device, const ALCchar *deviceName)
 106 {
 107     wave_data *data;
 108     const char *fname;
 109
 110     fname = GetConfigValue("wave", "file", "");
 111     if(!fname[0])
 112         return ALC_FALSE;
 113
 114     if(!deviceName)
 115         deviceName = waveDevice;
 116     else if(strcmp(deviceName, waveDevice) != 0)
 117         return ALC_FALSE;
 118
 119     data = (wave_data*)calloc(1, sizeof(wave_data));
 120
 121     data->f = fopen(fname, "wb");
 122     if(!data->f)
 123     {
 124         free(data);
 125         AL_PRINT("Could not open file '%s': %s\n", fname, strerror(errno));
 126         return ALC_FALSE;
 127     }
 128
 129     device->szDeviceName = strdup(deviceName);
 130     device->ExtraData = data;
 131     return ALC_TRUE;
 132 }
 133
 134 static void wave_close_playback(ALCdevice *device)
 135 {
 136     wave_data *data = (wave_data*)device->ExtraData;
 137
 138     fclose(data->f);
 139     free(data);
 140     device->ExtraData = NULL;
 141 }
 142
 143 static ALCboolean wave_reset_playback(ALCdevice *device)
 144 {
 145     wave_data *data = (wave_data*)device->ExtraData;
 146     ALuint channels, bits, i;
 147
 148     fseek(data->f, 0, SEEK_SET);
 149     clearerr(data->f);
 150
 151     bits = aluBytesFromFormat(device->Format) * 8;
 152     channels = aluChannelsFromFormat(device->Format);
 153
 154     if(channels != 1 && channels != 2)
 155     {
 156         if(bits == 8)
 157             device->Format = AL_FORMAT_STEREO8;
 158         else
 159         {
 160             device->Format = AL_FORMAT_STEREO16;
 161             bits = 16;
 162         }
 163         channels = 2;
 164     }
 165     else if(bits != 8 && bits != 16)
 166     {
 167         if(channels == 1)
 168             device->Format = AL_FORMAT_MONO16;
 169         else
 170             device->Format = AL_FORMAT_STEREO16;
 171         bits = 16;
 172     }
 173
 174     fprintf(data->f, "RIFF");
 175     fputc(0, data->f); // 'RIFF' header len; filled in at close
 176     fputc(0, data->f);
 177     fputc(0, data->f);
 178     fputc(0, data->f);
 179
 180     fprintf(data->f, "WAVE");
 181
 182     fprintf(data->f, "fmt ");
 183     fputc(16, data->f); // 'fmt ' header len; 16 bytes for PCM
 184     fputc(0, data->f);
 185     fputc(0, data->f);
 186     fputc(0, data->f);
 187     // 16-bit val, format type id (PCM: 1)
 188     fputc(1, data->f);
 189     fputc(0, data->f);
 190     // 16-bit val, channel count
 191     fputc(channels&0xff, data->f);
 192     fputc((channels>>8)&0xff, data->f);
 193     // 32-bit val, frequency
 194     fputc(device->Frequency&0xff, data->f);
 195     fputc((device->Frequency>>8)&0xff, data->f);
 196     fputc((device->Frequency>>16)&0xff, data->f);
 197     fputc((device->Frequency>>24)&0xff, data->f);
 198     // 32-bit val, bytes per second
 199     i = device->Frequency * channels * bits / 8;
 200     fputc(i&0xff, data->f);
 201     fputc((i>>8)&0xff, data->f);
 202     fputc((i>>16)&0xff, data->f);
 203     fputc((i>>24)&0xff, data->f);
 204     // 16-bit val, frame size
 205     i = channels * bits / 8;
 206     fputc(i&0xff, data->f);
 207     fputc((i>>8)&0xff, data->f);
 208     // 16-bit val, bits per sample
 209     fputc(bits&0xff, data->f);
 210     fputc((bits>>8)&0xff, data->f);
 211
 212     fprintf(data->f, "data");
 213     fputc(0, data->f); // 'data' header len; filled in at close
 214     fputc(0, data->f);
 215     fputc(0, data->f);
 216     fputc(0, data->f);
 217
 218     if(ferror(data->f))
 219     {
 220         AL_PRINT("Error writing header: %s\n", strerror(errno));
 221         return ALC_FALSE;
 222     }
 223
 224     data->DataStart = ftell(data->f);
 225
 226     data->size = device->UpdateSize * channels * bits / 8;
 227     data->buffer = malloc(data->size);
 228     if(!data->buffer)
 229     {
 230         AL_PRINT("buffer malloc failed\n");
 231         return ALC_FALSE;
 232     }
 233
 234     SetDefaultWFXChannelOrder(device);
 235
 236     data->thread = StartThread(WaveProc, device);
 237     if(data->thread == NULL)
 238     {
 239         free(data->buffer);
 240         data->buffer = NULL;
 241         return ALC_FALSE;
 242     }
 243
 244     return ALC_TRUE;
 245 }
 246
 247 static void wave_stop_playback(ALCdevice *device)
 248 {
 249     wave_data *data = (wave_data*)device->ExtraData;
 250     ALuint dataLen;
 251     long size;
 252
 253     if(!data->thread)
 254         return;
 255
 256     data->killNow = 1;
 257     StopThread(data->thread);
 258     data->thread = NULL;
 259
 260     data->killNow = 0;
 261
 262     free(data->buffer);
 263     data->buffer = NULL;
 264
 265     size = ftell(data->f);
 266     if(size > 0)
 267     {
 268         dataLen = size - data->DataStart;
 269         if(fseek(data->f, data->DataStart-4, SEEK_SET) == 0)
 270         {
 271             fputc(dataLen&0xff, data->f); // 'data' header len
 272             fputc((dataLen>>8)&0xff, data->f);
 273             fputc((dataLen>>16)&0xff, data->f);
 274             fputc((dataLen>>24)&0xff, data->f);
 275         }
 276         if(fseek(data->f, 4, SEEK_SET) == 0)
 277         {
 278             size -= 8;
 279             fputc(size&0xff, data->f); // 'WAVE' header len
 280             fputc((size>>8)&0xff, data->f);
 281             fputc((size>>16)&0xff, data->f);
 282             fputc((size>>24)&0xff, data->f);
 283         }
 284     }
 285 }
 286
 287
 288 static ALCboolean wave_open_capture(ALCdevice *pDevice, const ALCchar *deviceName)
 289 {
 290     (void)pDevice;
 291     (void)deviceName;
 292     return ALC_FALSE;
 293 }
 294
 295
 296 BackendFuncs wave_funcs = {
 297     wave_open_playback,
 298     wave_close_playback,
 299     wave_reset_playback,
 300     wave_stop_playback,
 301     wave_open_capture,
 302     NULL,
 303     NULL,
 304     NULL,
 305     NULL,
 306     NULL
 307 };
 308
 309 void alc_wave_init(BackendFuncs *func_list)
 310 {
 311     *func_list = wave_funcs;
 312 }
 313
 314 void alc_wave_deinit(void)
 315 {
 316 }
 317
 318 void alc_wave_probe(int type)
 319 {
 320     if(!ConfigValueExists("wave", "file"))
 321         return;
 322
 323     if(type == DEVICE_PROBE)
 324         AppendDeviceList(waveDevice);
 325     else if(type == ALL_DEVICE_PROBE)
 326         AppendAllDeviceList(waveDevice);
 327 }